WO2024000140A1 - 报文发送 - Google Patents

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Publication number
WO2024000140A1
WO2024000140A1 PCT/CN2022/101725 CN2022101725W WO2024000140A1 WO 2024000140 A1 WO2024000140 A1 WO 2024000140A1 CN 2022101725 W CN2022101725 W CN 2022101725W WO 2024000140 A1 WO2024000140 A1 WO 2024000140A1
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Prior art keywords
service message
service
message
copy
network device
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PCT/CN2022/101725
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English (en)
French (fr)
Inventor
李�昊
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New H3C Technologies Co Ltd
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New H3C Technologies Co Ltd
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Application filed by New H3C Technologies Co Ltd filed Critical New H3C Technologies Co Ltd
Priority to EP22948263.3A priority Critical patent/EP4425852A4/en
Priority to US18/714,687 priority patent/US20250030634A1/en
Priority to CN202280001942.4A priority patent/CN117643019A/zh
Priority to PCT/CN2022/101725 priority patent/WO2024000140A1/zh
Publication of WO2024000140A1 publication Critical patent/WO2024000140A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/74—Address processing for routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/02—Topology update or discovery
    • H04L45/036—Updating the topology between route computation elements, e.g. between OpenFlow controllers
    • H04L45/037—Routes obligatorily traversing service-related nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/34—Source routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/76—Routing in software-defined topologies, e.g. routing between virtual machines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/22—Parsing or analysis of headers

Definitions

  • This application relates to the field of communication technology, and in particular to message sending.
  • SRH Segment Routing Header
  • SRH includes a segment list (Segment List).
  • the segment list indicates the forwarding path of the service message in the SRv6 network, and the nodes in the SRv6 network can forward the service message based on this forwarding path.
  • the head node can also add the flow detection option in the service packet.
  • each node on the forwarding path can perform flow detection on the service packet based on the flow detection option.
  • Flow detection and periodic reporting of measurement information to the analyzer so that the analyzer can determine the network performance of the forwarding path based on the measurement information.
  • the following detection options can include dyeing bits, such as delay dyeing flags and packet loss dyeing flags. The delay dyeing flag indicates whether delay detection is required, and the packet loss dyeing flag indicates whether packet loss detection is required.
  • the SRv6 network can be combined with the service chain function.
  • Some endpoint nodes in the SRv6 network can be used as Service Function Forwarder (SFF) nodes according to actual service requirements.
  • SFF nodes are combined with the service function (Service Function, SF) node connection. If the type of the SFF node is End.AD or End.AS, then after receiving the service packet, the SFF node needs to delete the IPv6 header, flow detection option and SRH in the outer layer of the service packet, and send the original service to the SF message, after the SF node completes processing, it forwards the processed original service message back to the SFF node.
  • SFF Service Function
  • the SFF node re-encapsulates the IPv6 header, flow detection options and SRH for the original service packet based on its own static configuration information or dynamic cache.
  • the static configuration information includes pre-configured information for encapsulating the IPv6 header and SRH.
  • the dynamic cache is The SFF node learns the information used to encapsulate the IPv6 header and SRH based on the received packets.
  • the value of the dye bits added by the head node for different service packets will dynamically change with the number of service packets received by the head node. That is, the value of the dye bits added by the head node for each service packet cannot be determined in advance. As a result, the SFF node cannot recover the flow detection options based on static configuration information or dynamic cache, and thus cannot detect the forwarding path based on the flow detection technology.
  • embodiments of the present application provide a message sending method, the method is applied to network equipment, and the method includes:
  • the first service message includes the destination address, the first flow detection option, the segment routing header SRH and the original service message.
  • the SRH includes a SID list, and the SID list indicates the forwarding path. ;
  • the destination address is a locally configured proxy SID, send the second service message on the forwarding path, and send the original service message to the service function node;
  • the second service message includes a second along-flow detection option
  • the second along-flow detection option includes copy mark information
  • the copy mark information is used to indicate that the second service message is the first Copy of business packets.
  • the method before sending the second service message on the forwarding path, the method further includes:
  • the method before sending the first service message on the forwarding path, the method further includes:
  • the first service message is sent on the forwarding path.
  • the method before sending the second service message on the forwarding path, the method further includes:
  • the obtaining the link status of the link between the network device and the service function node specifically includes:
  • the link status is unreachable
  • the link status is reachable.
  • the flow detection option of the second service packet includes a reserved field, and the reserved field carries the copy mark information.
  • embodiments of the present application provide a message sending device, the device is applied to network equipment, and the device includes:
  • a receiving module configured to receive a first service message.
  • the first service message includes a destination address, a first flow detection option, a segment routing header SRH and an original service message.
  • the SRH includes a SID list, and the The SID list indicates the forwarding path;
  • a sending module configured to send the second service message on the forwarding path if the destination address is a locally configured proxy SID, and send the original service message to the service function node;
  • the second service message includes a second along-flow detection option
  • the second along-flow detection option includes copy mark information
  • the copy mark information is used to indicate that the second service message is the first Copy of business packets.
  • the device further includes: a judgment module and a copy module;
  • the determination module is used to determine whether the first flow detection option includes copy mark information
  • the sending module is specifically configured to send the first service message on the forwarding path if the judgment result of the judgment module is yes;
  • the copy module is configured to copy the first service message if the judgment result of the judgment module is no, and add the copy mark information to the flow detection option of the copied first service message, Obtain the second service message.
  • the device further includes: a first discarding module
  • the determination module is also used to determine whether the destination address is the last SID in the SID list
  • the first discard module is configured to discard the first service message if the judgment result of the judgment module is yes;
  • the sending module is specifically configured to send the first service message on the forwarding path if the judgment result of the judgment module is no.
  • the device further includes: an acquisition module, a second discarding module and a copying module;
  • the acquisition module is used to acquire the link status of the link between the network device and the service function node;
  • the second discarding module is configured to discard the first service message if the link status is unreachable
  • the copy module is configured to copy the first service message if the link status is reachable, and add the copy mark information to the flow-following detection option of the copied first service message, to obtain The second service message.
  • the acquisition module is specifically used to:
  • the link status is unreachable
  • the link status is reachable.
  • the flow detection option of the second service packet includes a reserved field, and the reserved field carries the copy mark information.
  • embodiments of the present application provide a network device, where the network device includes:
  • a machine-readable storage medium that stores machine-executable instructions that can be executed by the processor; the machine-executable instructions cause the processor to perform the following steps:
  • a first service message is received through the transceiver.
  • the first service message includes a destination address, a first flow detection option, a segment routing header SRH and an original service message.
  • the SRH includes a SID list, and the The SID list indicates the forwarding path;
  • the destination address is a locally configured proxy SID, send the second service message on the forwarding path through the transceiver, and send the original service message to the service function node;
  • the second service message includes a second along-flow detection option
  • the second along-flow detection option includes copy mark information
  • the copy mark information is used to indicate that the second service message is the first Copy of business packets.
  • machine-executable instructions also cause the processor to perform the following steps:
  • machine-executable instructions also cause the processor to perform the following steps:
  • the first service message is sent on the forwarding path through the transceiver.
  • machine-executable instructions also cause the processor to perform the following steps:
  • machine-executable instructions also cause the processor to perform the following steps:
  • the link status is unreachable
  • the link status is reachable.
  • the flow detection option of the second service packet includes a reserved field, and the reserved field carries the copy mark information.
  • embodiments of the present application provide a machine-readable storage medium that stores machine-executable instructions. When called and executed by a processor, the machine-executable instructions prompt the processor to: implement the first step above. method steps described in this aspect.
  • embodiments of the present application provide a computer program product, which causes the processor to: implement the method steps described in the first aspect.
  • the network device can send the second service packet on the forwarding path.
  • the second flow-following detection option of the second service packet includes copying. Mark information so that the second service packet will not be forwarded to the service function node, and there is no need to first delete the flow detection option of the second service packet and then re-encapsulate it, so that each network device on the forwarding path can receive it.
  • Receive the second service packet carrying the flow-following detection option and perform the flow-following detection.
  • the network device can normally send the original message to the service function node without affecting the processing of the service by the service function node. It can be seen that the embodiment of the present application realizes the flow of the forwarding path without affecting the service chain business. detection.
  • Figure 1a is a schematic diagram of a flow-following detection network provided by an embodiment of the present application.
  • Figure 1b is a schematic diagram of another flow-following detection network provided by an embodiment of the present application.
  • Figure 2 is a schematic diagram of a scenario combining an SRv6 network and a service chain provided by an embodiment of the present application
  • Figure 3 is a flow chart of a message sending method provided by an embodiment of the present application.
  • Figure 4 is a schematic diagram of a flow-following detection option provided by an embodiment of the present application.
  • Figure 5 is an exemplary schematic diagram of a message sending method provided by an embodiment of the present application.
  • Figure 6 is a schematic structural diagram of a message sending device provided by an embodiment of the present application.
  • Figure 7 is a schematic structural diagram of a network device provided by an embodiment of the present application.
  • Follow-the-flow detection uses normal forwarded business traffic to insert the follow-the-flow detection option into the specified service traffic.
  • the business traffic carrying the follow-the-flow detection option is detected through the forwarding device, and the collected measurement information is reported to the analyzer.
  • the analyzer detects and identifies subtle anomalies in the network based on the received measurement information, and accurately detects performance information such as delay and packet loss for each service, making the network quality SLA visible in real time and achieving rapid fault delineation and location.
  • Figure 1a is an exemplary schematic diagram of the structure of a flow-following detection network provided by an embodiment of the present application.
  • the flow-following detection network includes a head node, multiple intermediate nodes and a tail node.
  • Two intermediate nodes are shown as an example, namely intermediate node 1 and intermediate node 2.
  • Intermediate node 1 does not support flow-following detection
  • intermediate node 2 supports flow-following detection.
  • the head node is used to receive the real business flow. If it is determined that the business flow needs to be detected along the flow, the measurement data of the business flow will be sent to the analyzer, and the flow detection option will be added to the business flow. The service flow with the flow detection option is forwarded to the intermediate node 1 connected to itself.
  • intermediate node 1 does not support flow monitoring, the service flow is directly forwarded to intermediate node 2.
  • Intermediate node 2 is used to receive the service flow. If it is recognized that the service flow includes the flow detection option, and the measurement type indicated by the flow detection option is point-by-point measurement, then the service flow is sent to the analyzer based on the flow detection option. The measurement data of the flow is forwarded to the tail node. Alternatively, if the measurement type indicated by the flow detection option is end-to-end measurement, there is no need to send measurement data to the analyzer and the service flow can be forwarded to the tail node.
  • the tail node is used to receive the business flow. If it is recognized that the business flow includes the flow-following detection option, it will send the measurement data of the business flow to the analyzer based on the flow-following detection option and delete the flow-following detection in the business flow. option to forward the business flow.
  • Analyzer is used to receive the measurement data sent by the head node, intermediate node and tail node, and summarize and calculate the received measurement data. For example, it can perform packet loss and delay calculation to obtain the quality of the business flow path. .
  • the head node of the SRv6 network is usually used as the head node for flow detection. You can enable flow detection on the head node through the controller or command line, and specify the traffic characteristics and detection that need flow detection through ACL. cycle, type and other information.
  • the head node receives a service flow that meets the traffic characteristics, it inserts the flow-following detection option into the service flow.
  • the flow detection option can be carried by an IPv6 extension header, such as a hop-by-hop option (Hop-By-Hop option) extension header or a destination option (destination option) extension header.
  • Figure 1b is a schematic diagram of a more specific flow detection network.
  • PE1 is the head node of the SRv6 network. After PE1 receives the original message sent by CE1, if the original message is different from the one that needs flow detection, If the traffic characteristics match, the IPv6 header, flow detection option and SRH header are encapsulated in the outer layer of the original packet.
  • the source address (Source Address, SA) included in the IPv6 header is 8000::1, and the destination address (Destination Address, DA) is A:A:A:A:1: 1::, which is the address of P1.
  • On-stream detection options include:
  • FlowMonID is the ID of the detected service flow.
  • FlowNodeID is the identification of the head node through which the service flow passes.
  • the head node When the head node encapsulates the flow detection option for the service packet, it can add its own node identification in this field.
  • Header Type Indication (HTI) is used to indicate the extended data type carried.
  • T is used to indicate the detection type, which includes end-to-end detection and hop-by-hop detection.
  • L is the packet loss (Loss) mark.
  • D is the delay mark
  • P1 does not support flow detection, so after receiving the message, P1 updates the destination address of the message to A:A:A:A:2:1::, which is the address of P2, and forwards the message to P2. .
  • P2 After receiving the packet, P2 can identify the flow detection option included in the packet to perform flow detection on the packet. P2 will also update the destination address of the message to A:A:A:A:20:6::, which is the address of PE2, and forward the message to PE2.
  • PE2 After PE2 receives the packet, it can identify the flow detection option included in the packet to perform flow detection on the packet. Because PE2 is the tail node, PE2 deletes the IPv6 header, flow detection option, and SRH of the packet, and then sends the original packet to CE2.
  • PE1, P2, and PE2 when PE1, P2, and PE2 send and receive packets carrying the flow detection option, they will use the data of the packet based on the flow detection option (such as the timestamp of receiving the packet and the timestamp of sending the packet). ) performs statistics and periodically reports the flow ID and measurement information to the analyzer.
  • R1, R2 and R3 in Figure 1b are the process of reporting measurement information to analysis.
  • FIG. 2 is a schematic diagram of a scenario where the SRv6 network and the service chain are combined.
  • the SRv6 network in Figure 2 can be an SRv6 header compression (Generalized-SRv6, G-SRv6) network, that is, the SRH carries the compressed C-SID.
  • the SRH carries uncompressed C-SID.
  • the service chain path in the embodiment of this application refers to the additional path between the SFF node and the SF node in the forwarding path
  • the forwarding path refers to the path indicated by the segment identifier (Segment ID, SID) list.
  • the forwarding path refers to: head node-SFF1-SFF2-SFF3;
  • the service chain path refers to: head node-SFF1-SF1-SFF1-SFF2-SF2-SFF2-SFF3.
  • the head node i.e., the classifier in the service chain function scenario
  • receives the original packet Olinal Packet
  • SFF1 deletes the IPv6 header, SRH and flow detection options to obtain the original packet, and then sends the original packet to SF1.
  • SFF1 After SFF1 receives the original packet processed by SF1, it needs to re-encapsulate the IPv6 header, SRH and flow detection options for the processed packet. However, since the in-flow detection options are dyed on a per-flow or even per-packet basis, the SFF1 node cannot restore the in-flow detection options based on static configuration information or dynamic cache. As a result, the SFF1 node can only encapsulate the IPv6 header for the original packet after processing. and SRH, and sends a packet encapsulated with an IPv6 header and SRH to SFF2.
  • SFF2 sends packets encapsulated with IPv6 headers and SRH to SFF3.
  • the processed message will continue to be forwarded on the service chain path only after the SF node completes processing of the original message.
  • the SF node may perform in-depth analysis of the original message, which takes a long time, and the time consumed may be much longer than the time of direct transmission along the forwarding path indicated by the SID list.
  • the SF node may also discard the original packet, so the flow detection of the packets processed by the SF node cannot reflect the actual situation of the forwarding path indicated by the SID list, and cannot accurately detect the delay and packet loss of the forwarding path. detection.
  • embodiments of the present application provide a message sending method, which is applied to network devices. As shown in Figure 3, the method includes:
  • the first service message includes the destination address, the first flow detection option, the first SRH and the original service message.
  • the SRH includes a SID list, and the SID list indicates the forwarding path.
  • the first service message includes an IPv6 header, and the IPv6 header includes a destination address.
  • the second service message includes a second flow-following detection option
  • the second flow-following detection option includes copy mark information
  • the copy mark information is used to indicate that the second service message is a copy message of the first service message.
  • the network device can send the second service message on the forwarding path based on the SID list, and if the destination address is the locally configured proxy SID, it means that the network device is connected to the service function node, and the network device can outer layer the first service message.
  • the encapsulated first flow detection option, first SRH and IPv6 header are deleted, the original service message is obtained, and the original service message is forwarded to the service function node.
  • the network device When the service function node sends the processed original service message to the network device, the network device will re-encapsulate the SRH and IPv6 header for the received original service message based on local static configuration information or dynamic cache information, and obtain the third Business messages. Then, the network device can forward the third service packet based on the forwarding path indicated by the SID list, that is, the third service packet will be forwarded by the network device to the next network device on the forwarding path indicated by the SID list in the SRH. Among them, the third service packet does not contain the flow detection option.
  • the network device can be SFF1 in Figure 2.
  • SFF1 determines that the destination address is the locally configured proxy SID (specifically, it can be End.AS SID or End.AD SID), then the second service message is sent to SFF2, and the original service message included in the first service message is sent to SF1.
  • SFF1 After receiving the processed original service message sent by SF1, SFF1 encapsulates the IPv6 header and SRH header for the processed original service message, obtains the third service message, and then sends the third service message to SFF2.
  • SFF2 can receive the second service message and the third service message. After SFF2 recognizes the copy mark information included in the second flow-following detection option of the second service message, it will not copy the second service message. The message is sent to SF2, but the second message continues to be forwarded to SFF3 on the forwarding path. In addition, since the third service packet does not include the flow detection option, SFF2 can process the third service packet normally.
  • the network device after receiving the first service message, if the destination address of the first service message is the locally configured proxy SID, the network device sends the second service message on the forwarding path and sends it to the service function.
  • the node sends the original service message.
  • the flow-following detection option of the second service packet includes copy mark information, and the copy mark information is used to indicate that the second service message is a copy of the first service message.
  • the network device sends the second service message including the second flow-following detection option on the forwarding path, so that the second service message will not be forwarded to the service function node, and there is no need to delete the second service message first.
  • the flow detection option is then re-encapsulated, so that each network device on the forwarding path can receive the second service packet carrying the flow detection option and perform flow detection. Moreover, the network device can normally send the original service message to the service function node without affecting the service function node's processing of the service. It can be seen that the embodiment of the present application realizes the flow detection of the forwarding path without affecting the service. .
  • each node on the forwarding path performs flow detection based on the second service packet, which can accurately reflect the network performance of the forwarding path, and can perform accurate delay detection and packet loss detection on the forwarding path.
  • Both the first flow-following detection option and the second flow-following detection option of the first service packet include reserved fields, and the reserved fields of the second flow-following detection option carry copy mark information.
  • Figure 4 is a schematic diagram of the flow detection option provided by the embodiment of the present application.
  • the optional type occupies 8 bits and is the type of flow detection option.
  • Optional data length (Opt Data Len), which occupies 8 bits, is the length of the flow detection option.
  • FlowMonID which occupies 20 bits, is the ID of the detected service flow.
  • Header Type Indication is used to indicate the type of extended data carried.
  • a value of 0 indicates no extended data, and a value other than 0 indicates that extended data is carried.
  • NodeMonID which occupies 20 bits, is the device node identification.
  • the head node When the head node encapsulates the flow detection option for the service packet, it can add its own node identification in this field.
  • the service flow direction identification field used to carry the second indication information.
  • the head node of the reverse path automatically generates the service flow identification rule.
  • the value is 0, it indicates the first reverse path.
  • No business flow identification rules are generated for the head node of the path.
  • the head node of the reverse path is the tail node of the forward forwarding path.
  • the forward path is the path from PE1 to PE2
  • the reverse path is the path from PE2 to PE1.
  • PE2 in Figure 1b is the forward path.
  • the tail node of the path is also the head node of the reverse path.
  • T is used to indicate the detection type, which includes end-to-end detection and hop-by-hop detection.
  • Ext FM Type is an extended flow detection type field, which can be identified in the form of a bitmap.
  • the copy mark information may be carried by any of the reserved fields such as R, Rsv, and Reserved in Figure 4.
  • R the reserved fields
  • the R field located in the D field in Figure 4 can carry the replication flag bit information (replication Flag). If the replication Flag is set, that is, the value is 1, it means that the message is a replicated message; if the replication Flag is not If it is set, that is, if the value is 0, it means that the message is not a duplicate message.
  • the first message received by the network device may also be a copy message sent by the SFF node. Therefore, if the destination address of the first service message is the locally configured proxy SID, the network device sends it on the forwarding path. Before the second service packet, it can be determined whether the first flow-following detection option includes copy mark information;
  • the first flow-following detection option includes copy mark information
  • the first service packet is sent on the forwarding path.
  • the process may include performing flow detection based on the first flow detection option, and sending the first service packet on the forwarding path.
  • SFF2 receives the first service packet sent by SFF1. If the first flow detection option of the first service packet includes copy mark information, it means that the first service packet was received by SFF1. After receiving the service packet with the flow detection option, the service packet is copied. In this case, SFF2 does not need to copy the service packet again, but can continue to forward the first service packet along the forwarding path.
  • the first in-flow detection option does not include the copy mark information
  • copy the first service message and add the copy mark information in the in-flow detection option of the copied first service message to obtain the second service message. text, and then execute the above S302.
  • the network device copies the first service message to obtain the second service message.
  • the second service message has copy mark information added to the flow detection option.
  • the second service message Other contents included in the first service message are the same.
  • the network device may update the destination address in the IPv6 header of the second service message to the next SID located after the SID of the network device in the forwarding path.
  • the network device can further determine whether the destination address is the last SID in the SID list. If so, discard the first service message. If so, forward it according to the above method. The first service packet is sent on the path.
  • the destination address is the last SID in the SID list, it means that the network device that receives the first service message is the tail node of the forwarding path. Since the first service message includes copy mark information, it means that the first service message is a copied service message used for flow detection on the forwarding path. Therefore, after the tail node receives the first service message, it represents The first service message has been transmitted on the forwarding path, and the tail node does not need to continue sending the first service message to the CE device to avoid affecting the service.
  • the network device can determine whether the first flow-following detection option of the first service message includes copy mark information. In the case where the first service message includes the copy mark information, when forwarding the first service message on the forwarding path, there is no need to forward the first service message to the service function node, and there is no need to first delete the first service message.
  • the flow detection option is then re-encapsulated, so that each network device on the forwarding path can receive the first service packet carrying the flow detection option, and performs flow detection on the forwarding path based on the first service message, thereby enabling the flow detection option to be carried out along the forwarding path. Flow detection results can accurately reflect the quality of the forwarding path.
  • the network device copies the first service message and adds the copy mark information to the copied service message to obtain the second service message, so that the When subsequent network devices receive the second service packet, there is no need to forward the second service packet to the service function node, and there is no need to first delete the flow detection option of the second service packet and then re-encapsulate it, so that the forwarding path
  • Each network device on the network can receive the second service message carrying the flow detection option, and perform the flow detection on the forwarding path based on the second service message, which solves the problem of being unable to perform the flow detection on the forwarding path, making the flow detection easier. Flow detection results can accurately reflect the quality of the forwarding path.
  • the network before the network device sends the second service message on the forwarding path, or when the network device determines that the first flow-following detection option does not include copy mark information Under this condition, before sending the second service message on the forwarding path, the network may also obtain the link status of the link between the network device and the service function node.
  • the link status is unreachable, the first service packet is discarded;
  • the first service message is copied, and the copy mark information is added to the flow detection option of the copied first service message to obtain the second service message, and then the forwarding in the above embodiment is performed.
  • the steps of the second service message are performed.
  • the network device can monitor the link status with the service function node in real time and record the link status on the data plane. In this way, the network device can obtain the link status between the network device and the service function node from the data plane. The link status of the link.
  • the link status is unreachable
  • the link status is reachable.
  • the network device can determine whether there is a fault in the link between the network device and the service function node through the interface status of the local interface connected to the service function node. When the interface status is abnormal, it is determined that the link between the network device and the service function node is faulty; when the interface status is normal, it is determined that the link between the network device and the service function node is not faulty.
  • the network device may also determine the link status with the service function node through other methods in related technologies, which is not limited by the embodiments of the present application.
  • the forwarding switch between the network device and the service function node is set to off; if the service function node If the node is not faulty and the link between the network device and the service function node is not faulty, set the forwarding switch between the network device and the service function node to open.
  • the network device determines that the forwarding switch is in an open state, it determines that the link status is reachable; if it determines that the forwarding switch is in a closed state, it determines that the link status is unreachable.
  • the analyzer when the first service packet is discarded and the analyzer cannot receive the flow detection data reported by other network devices after the network device on the forwarding path based on the first service packet, it can be determined that the third service packet is discarded. There is a fault in the service chain path of a service packet. That is, the flow detection results of the analyzer can also reflect the link failure between the network device and the service function node, and then the analyzer triggers the head node to switch the service chain path in time to avoid affecting the service chain function for a long time.
  • the network device can also be configured to instruct the network device whether it needs to discard the first service packet when it determines that the link status is unreachable. For example, if there is no need to detect whether the link between the network device and the service function node is faulty through the flow detection technology, then even if the network device determines that the link status with the service function node is unreachable, the network device does not need to discard the first Instead, the first service message can be copied, and the copy mark information can be added to the flow detection option of the copied first service message to obtain the second service message, and the second service message can be sent on the forwarding path. text, so that subsequent forwarding paths can be detected along the flow. In this case, the head node can detect whether the link status between the network device and the service function node is reachable through other detection methods in the related technology, which is not limited by the embodiment of the present application.
  • the network device obtains the link status of the link with the service function node and determines whether the first service message needs to be discarded according to whether the link status is reachable. If it is not reachable, the first service message is copied. message, and generates a second service message, and transmits the second service message on the forwarding path, so that the forwarding path can be detected along the flow; if it is unreachable, the first service message is discarded, so that the analyzer can detect it in time
  • the service chain path fails, thus triggering the head node to switch the service chain path in time to avoid affecting the service chain function for a long time.
  • the message sending method provided by the embodiment of this application is introduced below based on specific scenarios.
  • the head node receives the original service message, it encapsulates the IPv6 header, flow detection option and SRH in the outer layer of the original service message. Afterwards, the first service message is obtained and the first service message is sent to SFF1.
  • the destination address of the IPv6 header of the first service message is SFF1
  • the Segment List included in the SRH is SFF1::SF1, SFF2::SF2, and SFF3.
  • SFF1::SF1 is the SID of SFF1, and the type can be End.AD or End.AS, which is used to guide SFF1 to send the message to SF1;
  • SFF2::SF2 is the SID of SFF2.
  • the type can be End.AD or End.AS. It is used to guide SFF2 to send the message to SF2;
  • SFF3 is the SID of SFF3, and the type can be a common End type.
  • SFF1 copies the first service message to obtain the second service message, adds copy mark information to the flow detection option of the second service message, and then sends the second service message on the forwarding path. service message and sends the original service message to SF1.
  • SFF1 After receiving the processed original service message sent by SF1, SFF1 encapsulates the SRH and IPv6 header for the processed original service message, obtains the third service message, and sends the third service message to SFF2.
  • SFF2 can receive the second service message and the third service message.
  • SFF2 recognizes that the flow-following detection option included in the second service includes copy mark information, and performs the flow-following detection based on the flow-following detection option, and forwards the second service message to SFF3.
  • SFF2 can send the original service message in the third service message to SF2. After receiving the original service message processed by SF2, SFF2 encapsulates the IPv6 header and SRH header for the processed original service message to obtain the fourth service message. message, and forwards the fourth service message to SFF3.
  • SFF3 can receive the second service message and the fourth service message. Since SFF3 is the tail node, SFF3 can send the original service message included in the fourth service message to subsequent devices (such as CE devices) and discard the second service message. Business messages.
  • the SID types of SFF1 and SFF3 can also be End.AM type.
  • SFF1 and SFF2 still send the second service packet on the forwarding path according to the above method, and according to the End.AM type
  • the processing method of the node is to process the first service message.
  • embodiments of the present application also provide a message sending device, which is applied to network equipment.
  • the device includes:
  • the receiving module 601 is used to receive the first service message.
  • the first service message includes the destination address, the first flow detection option, the segment routing header SRH and the original service message.
  • the SRH includes a SID list, and the SID list indicates the forwarding path. ;
  • the sending module 602 is used to send the second service message on the forwarding path if the destination address is the locally configured proxy SID, and send the original service message to the service function node;
  • the second service message includes a second flow-following detection option
  • the second flow-following detection option includes copy mark information
  • the copy mark information is used to indicate that the second service message is a copy message of the first service message.
  • the device also includes: a judgment module and a copy module;
  • a judgment module used to judge whether the first flow detection option includes copy mark information
  • the sending module 602 is also configured to send the first service message on the forwarding path if the judgment result of the judgment module is yes;
  • the copy module is used to copy the first service message if the judgment result of the judgment module is no, and add copy mark information to the flow detection option of the copied first service message to obtain the second service message.
  • the device further includes: a first discarding module
  • the judgment module is also used to judge whether the destination address is the last SID in the SID list
  • the first discard module is used to discard the first service message if the judgment result of the judgment module is yes;
  • the sending module 602 is configured to send the first service message on the forwarding path if the judgment result of the judgment module is no.
  • the device also includes: an acquisition module, a second discarding module and a copying module;
  • the acquisition module is used to obtain the link status of the link between the network device and the service function node;
  • the second discard module is used to discard the first service packet if the link status is unreachable
  • the copy module is used to copy the first service message if the link status is reachable, and add copy mark information to the flow-following detection option of the copied first service message to obtain the second service message.
  • the link status is unreachable
  • the link status is reachable.
  • the flow detection option of the second service packet includes a reserved field, and the reserved field carries copy mark information.
  • the network device includes: a processor 701; a transceiver 704; and a machine-readable storage medium 702.
  • the machine-readable storage medium 702 stores information that can be Machine-executable instructions executed by the processor 701; the machine-executable instructions cause the processor 701 to perform the following steps:
  • the first service message includes the destination address, the first flow detection option, the segment routing header SRH and the original service message.
  • the SRH includes a SID list, and the SID list indicates the forwarding path;
  • the second service message is sent on the forwarding path through the transceiver 704, and the original service message is sent to the service function node;
  • the second service message includes a second flow-following detection option
  • the second flow-following detection option includes copy mark information
  • the copy mark information is used to indicate that the second service message is a copy message of the first service message.
  • machine-executable instructions also cause processor 701 to perform the following steps:
  • the first service message is copied, and the copy mark information is added to the flow detection option of the copied first service message to obtain the second service message.
  • machine-executable instructions also cause processor 701 to perform the following steps:
  • the first service packet is sent on the forwarding path through the transceiver 704.
  • machine-executable instructions also cause processor 701 to perform the following steps:
  • the link status is unreachable, the first service packet is discarded;
  • the link status is reachable, the first service message is copied, and the copy mark information is added to the flow-following detection option of the copied first service message to obtain the second service message.
  • machine-executable instructions also cause processor 701 to perform the following steps:
  • the link status is unreachable
  • the link status is reachable.
  • the flow detection option of the second service packet includes a reserved field, and the reserved field carries copy mark information.
  • the network device may also include a communication bus 703.
  • the processor 701, the machine-readable storage medium 702 and the transceiver 704 complete communication with each other through the communication bus 703.
  • the communication bus 703 can be a peripheral component interconnect standard (Peripheral Component Interconnect, PCI) bus or an extended industry standard structure. (Extended Industry Standard Architecture, EISA) bus, etc.
  • PCI peripheral component interconnect standard
  • EISA Extended Industry Standard Architecture
  • the communication bus 703 can be divided into an address bus, a data bus, a control bus, etc.
  • the transceiver 704 may be a wireless communication module. Under the control of the processor 701, the transceiver 704 performs data interaction with other devices.
  • the machine-readable storage medium 702 may include random access memory (Random Access Memory, RAM) or non-volatile memory (Non-Volatile Memory, NVM), such as at least one disk storage.
  • RAM Random Access Memory
  • NVM Non-Volatile Memory
  • the machine-readable storage medium 702 may also be at least one storage device located remotely from the aforementioned processor.
  • the processor 701 can be a general-purpose processor, including a central processing unit (CPU), a network processor (Network Processor, NP), etc.; it can also be a digital signal processor (Digital Signal Processing, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.
  • CPU central processing unit
  • NP Network Processor
  • DSP Digital Signal Processing
  • ASIC Application Specific Integrated Circuit
  • FPGA Field-Programmable Gate Array
  • the embodiments of the present application also provide a machine-readable storage medium.
  • the machine-readable storage medium stores machine-executable information that can be executed by the processor. instruction.
  • the processor is caused by machine-executable instructions to implement the steps of any of the above message sending methods.
  • a computer program product containing instructions is also provided, which, when run on a computer, causes the computer to perform the steps of any of the message sending methods in the above embodiments.

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Abstract

本申请提供报文发送，涉及通信技术领域，本申请方案包括：接收第一业务报文，第一业务报文包括目的地址、第一随流检测选项、分段路由头SRH和原始业务报文，SRH包括SID列表，SID列表指示转发路径；若目的地址为本地配置的代理SID，则在转发路径上发送第二业务报文，并向服务功能节点发送原始业务报文；其中，第二业务报文包括第二随流检测选项，第二随流检测选项包括复制标记信息，复制标记信息用于指示第二业务报文为第一业务报文的复制报文。可以实现在不影响服务链业务的基础上，对转发路径进行随流检测。

Description

报文发送 技术领域
本申请涉及通信技术领域，尤其涉及报文发送。
背景技术
在互联网协议第6版段路由(Segment Routing Internet Protocol Version 6，SRv6)网络中，头节点在接收到业务报文后，可在业务报文的外层封装分段路由头(Segment Routing Header，SRH)，SRH中包括段列表(Segment List)，段列表指示该业务报文在SRv6网络中的转发路径，进而SRv6网络中的节点可以基于该转发路径转发业务报文。
为了对业务流量进行随流检测，头节点还可以在业务报文中添加随流检测选项，转发路径上的各节点接收到该业务报文后，可基于随流检测选项对业务报文进行随流检测，并周期性将测量信息上报给分析器，进而分析器可基于测量信息确定转发路径的网络性能。随流检测选项可以包括染色位，比如时延染色标记和丢包染色标记，时延染色标记表示是否需要进行时延检测，丢包染色标记表示是否需要进行丢包检测。
目前SRv6网络可以与服务链功能结合，可根据实际的服务需求，将SRv6网络中的部分端点(endpoint)节点作为服务功能转发(Service Function Forwarder，SFF)节点，SFF节点与服务功能(Service Function，SF)节点连接。如果SFF节点的类型为End.AD或End.AS，那么SFF节点接收到业务报文后，需将业务报文外层封装的IPv6头、随流检测选项和SRH均删除，向SF发送原始业务报文，SF节点完成处理后，再将处理完成的原始业务报文转发回SFF节点。SFF节点基于自身的静态配置信息或者动态缓存重新为原始业务报文封装IPv6头、随流检测选项和SRH，其中，静态配置信息包括预先配置的用于封装IPv6头和SRH的信息，动态缓存为SFF节点基于接收到的报文学习到的用于封装IPv6头和SRH的信息。
然而，头节点为不同的业务报文添加的染色位的值会随着头节点接收到的业务报文数量动态变化，即头节点为每个业务报文添加的染色位的值无法预先确定，导致SFF节点无法基于静态配置信息或者动态缓存恢复出随流检测选项，进而无法基于随流检测技术对转发路径进行检测。
发明内容
本申请的目的在于报文发送，以基于随流检测技术对转发路径进行检测。具体技术方案如下：
第一方面，本申请实施例提供了一种报文发送方法，所述方法应用于网络设备，所述方法包括：
接收第一业务报文，所述第一业务报文包括目的地址、第一随流检测选项、分段路由头SRH和原始业务报文，所述SRH包括SID列表，所述SID列表指示转发路径；
若所述目的地址为本地配置的代理SID，则在所述转发路径上发送第二业务报文，并向服务功能节点发送所述原始业务报文；
其中，所述第二业务报文包括第二随流检测选项，所述第二随流检测选项包括复制标记信息，所述复制标记信息用于指示所述第二业务报文为所述第一业务报文的复制报文。
在一种可能的实现方式中，所述在所述转发路径上发送第二业务报文之前，所述方法还包括：
判断所述第一随流检测选项中是否包括复制标记信息；
若是，则在所述转发路径上发送所述第一业务报文；
若否，则复制所述第一业务报文，并在复制的第一业务报文的随流检测选项中添加所述复制标记信息，得到所述第二业务报文。
在一种可能的实现方式中，在所述转发路径上发送所述第一业务报文之前，所述方法还包括：
判断所述目的地址是否为所述SID列表中最后一个SID；
若是，则丢弃所述第一业务报文；
若否，则在所述转发路径上发送所述第一业务报文。
在一种可能的实现方式中，在所述转发路径上发送第二业务报文之前，所述方法还包括：
获取所述网络设备与所述服务功能节点之间链路的链路状态；
若所述链路状态为不可达，则丢弃所述第一业务报文；
若所述链路状态为可达，则复制所述第一业务报文，并在复制的第一业务报文的随流检测选项中添加所述复制标记信息，得到所述第二业务报文。
在一种可能的实现方式中，所述获取所述网络设备与所述服务功能节点之间链路的链路状态，具体包括：
从数据平面获取所述网络设备与所述服务功能节点之间链路的链路状态；
其中，若所述服务功能节点故障和/或所述网络设备与所述服务功能节点之间链路存在故障，则所述链路状态为不可达；
若所述服务功能节点未故障，且所述网络设备与所述服务功能节点之间链路未故障，则所述链路状态为可达。
在一种可能的实现方式中，所述第二业务报文的随流检测选项包括保留字段，所述保留字段承载所述复制标记信息。
第二方面，本申请实施例提供了一种报文发送装置，所述装置应用于网络设备，所述装置包括：
接收模块，用于接收第一业务报文，所述第一业务报文包括目的地址、 第一随流检测选项、分段路由头SRH和原始业务报文，所述SRH包括SID列表，所述SID列表指示转发路径；
发送模块，用于若所述目的地址为本地配置的代理SID，则在所述转发路径上发送第二业务报文，并向服务功能节点发送所述原始业务报文；
其中，所述第二业务报文包括第二随流检测选项，所述第二随流检测选项包括复制标记信息，所述复制标记信息用于指示所述第二业务报文为所述第一业务报文的复制报文。
在一种可能的实现方式中，所述装置还包括：判断模块和复制模块；
所述判断模块，用于判断所述第一随流检测选项中是否包括复制标记信息；
所述发送模块，具体用于若所述判断模块的判断结果为是，则在所述转发路径上发送所述第一业务报文；
所述复制模块，用于若所述判断模块的判断结果为否，则复制所述第一业务报文，并在复制的第一业务报文的随流检测选项中添加所述复制标记信息，得到所述第二业务报文。
在一种可能的实现方式中，所述装置还包括：第一丢弃模块；
所述判断模块，还用于判断所述目的地址是否为所述SID列表中最后一个SID；
所述第一丢弃模块，用于若所述判断模块的判断结果为是，则丢弃所述第一业务报文；
所述发送模块，具体用于若所述判断模块的判断结果为否，则在所述转发路径上发送所述第一业务报文。
在一种可能的实现方式中，所述装置还包括：获取模块、第二丢弃模块和复制模块；
所述获取模块，用于获取所述网络设备与所述服务功能节点之间链路的链路状态；
所述第二丢弃模块，用于若所述链路状态为不可达，则丢弃所述第一业务报文；
所述复制模块，用于若所述链路状态为可达，则复制所述第一业务报文，并在复制的第一业务报文的随流检测选项中添加所述复制标记信息，得到所述第二业务报文。
在一种可能的实现方式中，所述获取模块，具体用于：
从数据平面获取所述网络设备与所述服务功能节点之间链路的链路状态；
其中，若所述服务功能节点故障和/或所述网络设备与所述服务功能节点之间链路存在故障，则所述链路状态为不可达；
若所述服务功能节点未故障，且所述网络设备与所述服务功能节点之间链路未故障，则所述链路状态为可达。
在一种可能的实现方式中，所述第二业务报文的随流检测选项包括保留字段，所述保留字段承载所述复制标记信息。
第三方面，本申请实施例提供了一种网络设备，所述网络设备包括：
处理器；
收发器；
机器可读存储介质，所述机器可读存储介质存储有能够被所述处理器执行的机器可执行指令；所述机器可执行指令促使所述处理器执行以下步骤：
通过所述收发器接收第一业务报文，所述第一业务报文包括目的地址、第一随流检测选项、分段路由头SRH和原始业务报文，所述SRH包括SID列表，所述SID列表指示转发路径；
若所述目的地址为本地配置的代理SID，则通过所述收发器在所述转发路径上发送第二业务报文，并向服务功能节点发送所述原始业务报文；
其中，所述第二业务报文包括第二随流检测选项，所述第二随流检测选项包括复制标记信息，所述复制标记信息用于指示所述第二业务报文为所述第一业务报文的复制报文。
在一种可能的实现方式中，所述机器可执行指令还促使所述处理器执行以下步骤：
判断所述第一随流检测选项中是否包括复制标记信息；
若是，则通过所述收发器在所述转发路径上发送所述第一业务报文；
若否，则复制所述第一业务报文，并在复制的第一业务报文的随流检测选项中添加所述复制标记信息，得到所述第二业务报文。
在一种可能的实现方式中，所述机器可执行指令还促使所述处理器执行以下步骤：
判断所述目的地址是否为所述SID列表中最后一个SID；
若是，则丢弃所述第一业务报文；
若否，则通过所述收发器在所述转发路径上发送所述第一业务报文。
在一种可能的实现方式中，所述机器可执行指令还促使所述处理器执行以下步骤：
获取所述网络设备与所述服务功能节点之间链路的链路状态；
若所述链路状态为不可达，则丢弃所述第一业务报文；
若所述链路状态为可达，则复制所述第一业务报文，并在复制的第一业务报文的随流检测选项中添加所述复制标记信息，得到所述第二业务报文。
在一种可能的实现方式中，所述机器可执行指令还促使所述处理器执行以下步骤：
从数据平面获取所述网络设备与所述服务功能节点之间链路的链路状态；
其中，若所述服务功能节点故障和/或所述网络设备与所述服务功能节点之间链路存在故障，则所述链路状态为不可达；
若所述服务功能节点未故障，且所述网络设备与所述服务功能节点之间链路未故障，则所述链路状态为可达。
在一种可能的实现方式中，所述第二业务报文的随流检测选项包括保留字段，所述保留字段承载所述复制标记信息。
第四方面，本申请实施例提供了一种机器可读存储介质，存储有机器可执行指令，在被处理器调用和执行时，所述机器可执行指令促使所述处理器：实现上述第一方面所述的方法步骤。
第五方面，本申请实施例提供了一种计算机程序产品，所述计算机程序产品促使所述处理器：实现上述第一方面所述的方法步骤。
采用以上技术方案，网络设备接收到携带第一随流检测选项的第一业务报文后，可以在转发路径上发送第二业务报文，第二业务报文的第二随流检测选项包括复制标记信息，使得第二业务报文不会被转发到服务功能节点，也就无需先删除第二业务报文的随流检测选项，再进行重新封装，使得转发路径上的各网络设备均可接收到携带随流检测选项的第二业务报文，并进行随流检测。并且，网络设备可正常向服务功能节点发送原始报文，不会影响服务功能节点对业务的处理，可见，本申请实施例实现了在不影响服务链业务的基础上，对转发路径进行随流检测。
附图说明
为了更清楚地说明本申请实施例和现有技术的技术方案，下面对实施例和现有技术中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的实施例。
图1a为本申请实施例提供的一种随流检测网络的示意图；
图1b为本申请实施例提供的另一种随流检测网络的示意图；
图2为本申请实施例提供的一种SRv6网络和服务链结合的场景示意图；
图3为本申请实施例提供的一种报文发送方法的流程图；
图4为本申请实施例提供的一种随流检测选项的示意图；
图5为本申请实施例提供的一种报文发送方法的示例性示意图；
图6为本申请实施例提供的一种报文发送装置的结构示意图；
图7为本申请实施例提供的一种网络设备的结构示意图。
具体实施方式
为使本申请的目的、技术方案、及优点更加清楚明白，以下参照附图并举实施例，对本申请进一步详细说明。显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
为方便理解，首先对本申请实施例涉及到的相关概念进行解释说明。
随流检测是利用正常转发的业务流量，在指定的业务流量中插入随流检测选项，经过转发设备对携带随流检测选项的业务流量进行检测，将采集到的测量信息上报给分析器，进而分析器基于接收到的测量信息检测识别网络中细微的异常，精准检测每个业务的时延、丢包等性能信息，使得网络质量SLA实时可视，做到快速故障定界和定位。
如图1a所示，图1a为本申请实施例提供的一种随流检测网络的结构的示例性示意图，该随流检测组网中包括头节点、多个中间节点和尾节点，图1a中示例性地示出了两个中间节点，分别为中间节点1和中间节点2，其中，中间节点1不支持随流检测，中间节点2支持随流检测。
头节点，用于接收真实的业务流，如果确定需要对该业务流进行随流检测，则向分析器发送对该业务流的测量数据，并在该业务流中添加随流检测选项，将携带随流检测选项的业务流转发给与自身相连的中间节点1。
因中间节点1不支持随流监测，所以直接将业务流转发给中间节点2。
中间节点2，用于接收业务流，如果识别到该业务流包括随流检测选项，且随流检测选项指示的测量类型为逐点测量，则基于该随流检测选项向分析器发送对该业务流的测量数据，并向尾节点转发该业务流。或者，如果随流检测选项指示的测量类型为端到端测量，则无需向分析器发送测量数据，可向尾节点转发该业务流。
尾节点，用于接收业务流，若识别到该业务流包括随流检测选项，则基于该随流检测选项向分析器发送对该业务流的测量数据，并删除该业务流中的随流检测选项，进而转发该业务流。
分析器，用于接收头节点、中间节点和尾节点发送的测量数据，并对接收到的测量数据进行汇总和计算，比如可以进行丢包和时延计算，以得到该业务流途径路径的质量。
对于SRv6的使用场景，通常将SRv6网络的头节点同时作为随流检测的头节点，可以通过控制器或命令行在头节点上开启随流检测，通过ACL指定需要随流检测的流量特征、检测的周期、类型等信息。头节点在接收到满足流量特征的业务流时，在业务流中插入随流检测选项。随流检测选项具体可以由IPv6扩展头承载，例如逐跳选项(Hop-By-Hop option)扩展头或目的选项(destination option)扩展头。
如图1b所示，图1b为一种更具体的随流检测网络的示意图，PE1为SRv6网络的头节点，PE1接收到CE1发送的原始报文后，如果原始报文与需要随流检测的流量特征匹配，则在原始报文的外层封装IPv6头，随流检测选项和SRH头。
参见图1b中PE1向P1发送的报文，其中IPv6头包括的源地址(Source Address，SA)为8000：：1，目的地址(Destination Address，DA)为A：A：A：A：1：1：：，即P1的地址。
随流检测选项包括：
FlowMonID，为检测的业务流的ID。
FlowNodeID，为业务流经过的头节点的标识，头节点在为业务报文封装随流检测选项时，可在该字段中添加自身的节点标识。
头类型指示(Header Type Indication，HTI)，用于表示携带的扩展数据类型。
P，为测量周期。
T，用于表示检测类型，检测类型包括端到端检测和逐跳检测。
L，为丢包(Loss)标记。
D，为时延(delay)标记。
上述P、T、L和D为染色位。
P1不支持随流检测，所以P1接收到该报文后，将报文的目的地址更新为A：A：A：A：2：1：：，即P2的地址，并向P2转发该报文。
P2接收到该报文后，可以识别该报文包括的随流检测选项，以对该报文进行随流检测。P2还会把该报文的目的地址更新为A：A：A：A：20：6：：，即PE2的地址，并向PE2转发该报文。
PE2接收到该报文后，可以识别该报文包括的随流检测选项，以对该报文进行随流检测。因PE2是尾节点，所以PE2会把报文的IPv6头、随流检测选项和SRH删除后，将原始报文发送给CE2。
其中，PE1、P2、PE2在收发携带随流检测选项的报文时，会根据随流检测选项对该报文的数据(比如接收到该报文的时间戳和发送出该报文的时间戳)进行统计，并周期性地将流ID和测量信息上报给分析器。图1b中的R1、R2和R3为将测量信息上报给分析的过程。
在SRv6网络中，可以基于上述随流检测技术对服务链路径进行随流检测，如图2所示，图2为一种SRv6网络和服务链结合的场景示意图。
其中，图2中的SRv6网络可以为SRv6头压缩(Generalized-SRv6，G-SRv6)网络，即SRH中携带压缩后的C-SID。或者，也可以应用于普通SRv6网络，即SRH中携带未压缩的C-SID。
需要说明的是，本申请实施例中的服务链路径是指在转发路径中，额外增加SFF节点与SF节点之间的路径，转发路径是指段标识(Segement ID，SID)列表指示的路径。
例如，图2中，转发路径是指：头节点-SFF1-SFF2-SFF3；服务链路径是指：头节点-SFF1-SF1-SFF1-SFF2-SF2-SFF2-SFF3。
图2中，头节点(即服务链功能场景下的分类器Classifier)接收到原始报文(Original Packet)后，在原始报文的外层封装IPv6头、SRH和随流检测选项，得到封装后的报文，然后向SFF1发送封装后的报文，SFF1接收到封装后的报文后，将IPv6头、SRH和随流检测选项删除，得到原始报文，再将 原始报文发送给SF1。
SFF1接收到SF1处理之后的原始报文后，需要重新为处理之后的报文封装IPv6头、SRH和随流检测选项。但由于随流检测选项是逐流甚至是逐包染色的，因此，SFF1节点无法基于静态配置信息或者动态缓存恢复出随流检测选项，导致SFF1节点只能为处理之后的原始报文封装IPv6头和SRH，并向SFF2发送封装有IPv6头和SRH的报文。
同理，SFF2向SFF3发送的也是封装有IPv6头和SRH的报文。
也就是说，图2所示的网络中，只有SFF1接收到的报文带有随流检测数据，导致分析器只能检测头节点到SFF1这一段的路径的网络性能，无法实现端到端的服务链路径的性能检测。
此外，由于原始报文需要被转发给SF节点，SF节点完成对原始报文的处理后，处理后的报文才会继续在服务链路径上转发。而SF节点可能会对原始报文进行深度解析，需要消耗较长的时间，消耗的时间可能远大于直接延SID列表指示的转发路径传输的时间。并且SF节点还可能会丢弃原始报文，所以通过SF节点处理后的报文进行随流检测，无法反应SID列表指示的转发路径的实际情况，无法对转发路径进行准确的时延检测和丢包检测。
为了解决上述问题，本申请实施例提供了一种报文发送方法，该方法应用于网络设备，如图3所示，该方法包括：
S301、接收第一业务报文。
其中，第一业务报文包括目的地址、第一随流检测选项、第一SRH和原始业务报文，SRH包括SID列表，SID列表指示转发路径。
其中，第一业务报文包括IPv6头，IPv6头包括目的地址。
S302、若目的地址为本地配置的代理SID，则在转发路径上发送第二业务报文，并向服务功能节点发送原始业务报文。
其中，第二业务报文包括第二随流检测选项，第二随流检测选项包括复制标记信息，复制标记信息用于指示第二业务报文为第一业务报文的复制报文。
网络设备可以基于SID列表，在转发路径上发送第二业务报文，并且若目的地址为本地配置的代理SID，则说明网络设备与服务功能节点连接，网络设备可以将第一业务报文外层封装的第一随流检测选项、第一SRH和IPv6头删除，得到原始业务报文，将原始业务报文转发到服务功能节点。
当服务功能节点将处理完成之后的原始业务报文发送到网络设备时，网络设备将根据本地静态配置信息或动态缓存信息，为接收到的原始业务报文重新封装SRH和IPv6头，得到第三业务报文。然后，网络设备可以基于SID列表指示的转发路径转发第三业务报文，即第三业务报文会被网络设备转发到SRH中SID列表指示的转发路径上的下一网络设备。其中，第三业务报文 不包含随流检测选项。
如图2所示，以图2的场景为例，网络设备可以为图2中的SFF1，SFF1接收到第一业务报文后，确定目地地址为本地配置的代理SID(具体可以为End.AS SID或者为End.AD SID)，则向SFF2发送第二业务报文，并向SF1发送第一业务报文包括的原始业务报文。SFF1接收到SF1发送的处理后的原始业务报文后，为处理后的原始业务报文封装IPv6头和SRH头，得到第三业务报文，然后向SFF2发送第三业务报文。
可以理解的是，SFF2可以接收到第二业务报文和第三业务报文，SFF2识别到第二业务报文的第二随流检测选项包括的复制标记信息后，就不会将第二业务报文发送给SF2，而是继续在转发路径上将第二报文转发给SFF3。另外，因第三业务报文不包括随流检测选项，所以SFF2可正常处理第三业务报文。
采用本申请实施例，网络设备在接收到第一业务报文之后，若第一业务报文的目的地址为本地配置的代理SID，则在转发路径上发送第二业务报文，并向服务功能节点发送原始业务报文。其中，第二业务报文的随流检测选项包括复制标记信息，复制标记信息用于指示第二业务报文为第一业务报文的复制报文。如此，网络设备通过在转发路径上发送包括第二随流检测选项的第二业务报文，使得第二业务报文不会被转发到服务功能节点，也就无需先删除第二业务报文的随流检测选项，再进行重新封装，使得转发路径上的各网络设备均可接收到携带随流检测选项的第二业务报文，并进行随流检测。并且，网络设备可正常向服务功能节点发送原始业务报文，不会影响服务功能节点对业务的处理，可见，本申请实施例实现了在不影响业务的基础上，对转发路径进行随流检测。
此外，由于上述第二业务报文不需要经过服务功能节点的处理，节省了转发时间，避免了被服务功能节点丢弃，由于第二业务报文在转发路径上传输，不会被转发到服务功能节点，所以转发路径上的各节点基于第二业务报文进行随流检测，可以准确反映转发路径的网络性能，可以对转发路径进行准确的时延检测和丢包检测。
上述第一业务报文的第一随流检测选项和第二随流检测均包括保留字段，第二随流检测选项的保留字段承载复制标记信息。
如图4所示，图4为本申请实施例提供的随流检测选项的示意图。
其中，可选类型(Option Type)，占用8bit，为随流检测选项的类型。
可选数据长度(Opt Data Len)，占用8bit，为随流检测选项的长度。
FlowMonID，占用20bit，为检测的业务流的ID。
L，占用1bit，为丢包(Loss)标记。
D，占用1bit，为时延(delay)标记。
R、Rsv和Reserved均为保留字段。
头类型指示(Header Type Indication，HTI)，用于表示携带的扩展数据类型，取值为0时表示无扩展数据，取值为非0时表示携带有扩展数据。
NodeMonID，占用20bit，为设备节点标识，头节点在为业务报文封装随流检测选项时，可在该字段中添加自身的节点标识。
F，占用1bit，为业务流方向标识字段，用于承载第二指示信息，取值为1时，指示反向路径的头节点自动生成业务流识别规则，取值为0时，指示第一反向路径的头节点不生成业务流识别规则。其中，反向路径的头节点为正向转发路径的尾节点，以图1b为例，正向路径为PE1到PE2的路径，反向路径为PE2到PE1的路径，图1b中的PE2是正向路径的尾节点，同时也是反向路径的头节点。
P，为测量周期。
T，用于表示检测类型，检测类型包括端到端检测和逐跳检测。
Ext FM Type为扩展流检测类型字段，可以通过位图(bitmap)的形式标识。
本申请实施例中，复制标记信息可以由图4中R、Rsv和Reserved等保留字段中任一字段承载，本申请实施例对此不做具体限定。例如，可以在图4中位于D字段的R字段中承载复制标记位信息(replication Flag)，若replication Flag被置位，即取值为1，则表示报文为复制报文；若replication Flag未被置位，即取值为0，则表示报文不是复制报文。
需要说明的是，网络设备接收到的第一报文也可能是SFF节点发送的复制报文，所以若第一业务报文的目的地址为本地配置的代理SID，则网络设备在转发路径上发送第二业务报文之前，可以判断第一随流检测选项中是否包括复制标记信息；
若是，即第一随流检测选项中包括复制标记信息，则在转发路径上发送第一业务报文。
如果第一随流检测选项中包括复制标记信息，则说明第一业务报文是复制得到的，网络设备无需再对第一业务报文进行复制，也无需对第一业务报文做服务链相关处理，可以基于第一随流检测选项进行随流检测，并在转发路径上发送第一业务报文。
以图2的场景为例，假设SFF2接收到SFF1发送的第一业务报文，如果第一业务报文的第一随流检测选项包括复制标记信息，则说明该第一业务报文为SFF1接收到带有随流检测选项的业务报文后，进行复制得到的业务报文，这种情况下SFF2无需再次对业务报文进行复制，而是可以继续沿转发路径转发第一业务报文。
若否，即第一随流检测选项中不包括复制标记信息，则复制第一业务报文，并在复制的第一业务报文的随流检测选项同添加复制标记信息，得到第二业务报文，然后执行上述S302。
可以理解的是，网络设备复制第一业务报文得到第二业务报文，第二业务报文相比于第一业务报文，在随流检测选项中增加了复制标记信息，第二业务报文与第一业务报文包括的其他内容均相同。网络设备为了在转发路径上转发第二业务报文，可以将第二业务报文的IPv6头中的目的地址更新为转发路径中，位于该网络设备的SID之后的下一个SID。
另外，如果第一随流检测选项中包括复制标记信息，网络设备还可以进一步判断目的地址是否为SID列表中最后一个SID，若是，则丢弃第一业务报文，若是，则按照上述方法在转发路径上发送第一业务报文。
可以理解的是，若目的地址是SID列表中的最后一个SID，说明接收到第一业务报文的网络设备为转发路径的尾节点。因第一业务报文包括复制标记信息，代表第一业务报文是复制得到的用于对转发路径进行随流检测的业务报文，所以尾节点接收到该第一业务报文后，就代表该第一业务报文已经完成在转发路径上的传输，尾节点无需继续向CE设备发送该第一业务报文，以避免影响业务。
采用本申请实施例，网络设备在接收到第一业务报文后，可以判断第一业务报文的第一随流检测选项是否包括复制标记信息。在第一业务报文包括复制标记信息的情况下，在转发路径上转发第一业务报文，不需要将第一业务报文转发到服务功能节点，也就无需先删除第一业务报文的随流检测选项，再进行重新封装，使得转发路径上的各个网络设备可以接收到携带随流检测选项的第一业务报文，基于第一业务报文对转发路径进行随流检测，进而使得随流检测结果可以准确反映转发路径的质量。
在第一业务报文不包括复制标记信息的情况下，网络设备复制第一业务报文，并在复制得到的业务报文中添加复制标记信息，得到第二业务报文，使得转发路径上的后续网络设备接到第二业务报文时，不需要将第二业务报文转发到服务功能节点，也就无需先删除第二业务报文的随流检测选项，再进行重新封装，使得转发路径上的各个网络设备均可以接收到携带随流检测选项的第二业务报文，基于第二业务报文对转发路径进行随流检测，解决了无法对转发路径进行随流检测的问题，使得随流检测结果可以准确反映转发路径的质量。
在本申请另一实施例中，在图3对应实施例中，网络设备在转发路径上发送第二业务报文之前，或者在网络设备确定第一随流检测选项中不包括复制标记信息的情况下，在转发路径上发送第二业务报文之前，网络还可以获取网络设备与服务功能节点之间链路的链路状态。
若链路状态为不可达，则丢弃第一业务报文；
若链路状态为可达，则复制第一业务报文，并在复制的第一业务报文的随流检测选项中添加复制标记信息，得到第二业务报文，然后执行上述实施 例中转发第二业务报文的步骤。
在一种实现方式中，网络设备可以实时监测与服务功能节点的之间的链路状态，并在数据平面记录链路状态，如此，网络设备可以从数据平面获取网络设备与服务功能节点之间链路的链路状态。
其中，若服务功能节点故障和/或网络设备与服务功能节点之间链路存在故障，则链路状态为不可达；
若服务功能节点未故障，且网络设备与服务功能节点之间链路未故障，则链路状态为可达。
网络设备可以通过本地与服务功能节点连接的接口的接口状态，确定网络设备与服务功能节点之间链路是否存在故障。当接口状态异常时，确定网络设备与服务功能节点之间链路存在故障；当接口状态正常时，确定网络设备与服务功能节点之间链路未故障。网络设备还可以通过相关技术的其他方法确定与服务功能节点之间的链路状态，对此本申请实施例不作限定。
另一种实现方式中，若网络设备确定服务功能节点故障和/或网络设备与服务功能节点之间链路故障，则将网络设备与服务功能节点之间的转发开关设置为关闭；若服务功能节点未故障，且网络设备与服务功能节点之间链路未故障，则将网络设备与服务功能节点之间的转发开关设置为打开。
进而，若网络设备确定转发开关为打开的状态，则确定链路状态为可达；若确定转发开关为关闭的状态，则确定链路状态为不可达。
可以理解的是，在第一业务报文被丢弃的情况下，分析器无法接收到转发路径上该网络设备之后的其他网络设备根据第一业务报文上报的随流检测数据，则可以确定第一业务报文的服务链路径存在故障。即分析器的随流检测结果也可以反映出网络设备与服务功能节点之间的链路故障，进而分析器及时触发头节点及时切换服务链路径，以避免长时间影响服务链功能。
可选地，还可以按照实际需要，通过配置指导网络设备在确定链路状态不可达的情况下，是否需要将第一业务报文丢弃。例如，如果不需要通过随流检测技术检测网络设备与服务功能节点之间的链路是否故障，则即使网络设备确定与服务功能节点之间的链路状态为不可达，网络设备也无需丢弃第一报文，而是可以复制第一业务报文，并在复制的第一业务报文的随流检测选项中添加复制标记信息，得到第二业务报文，在转发路径上发送第二业务报文，如此可以实现对后续转发路径的随流检测。在这种情况下，头节点可以通过相关技术中的其他检测方式检测网络设备与服务功能节点之间的链路状态是否可达，对此本申请实施例不作限制。
采用本申请实施例，网络设备通过获取与服务功能节点之间链路的链路状态，根据链路状态是否可达，判断是否需要丢弃第一业务报文，如果不可达，则复制第一业务报文，并生成第二业务报文，在转发路径上传输第二业务报文，进而可以对转发路径进行随流检测；如果不可达，则丢弃第一业务 报文，使得分析器可以及时发现服务链路径故障，从而触发头节点及时切换服务链路径，避免长时间影响服务链功能。
以下结合具体场景对本申请实施例提供的报文发送方法进行介绍，如图5所示，头节点接收到原始业务报文后，在原始业务报文外层封装IPv6头、随流检测选项和SRH后得到第一业务报文，向SFF1发送第一业务报文。
参见图5，第一业务报文的IPv6头的目的地址为SFF1，SRH中包括的Segment List为SFF1::SF1，SFF2::SF2，SFF3。
其中，SFF1::SF1为SFF1的SID，类型可以为End.AD或End.AS，用于指导SFF1将报文发送给SF1；
SFF2::SF2为SFF2的SID，类型可以为End.AD或End.AS，用于指导SFF2将报文发送给SF2；
SFF3为SFF3的SID，类型可以为普通的End类型。
SFF1接收到第一业务报文后，复制第一业务报文，得到第二业务报文，并在第二业务报文的随流检测选项中添加复制标记信息，进而在转发路径上发送第二业务报文，并向SF1发送原始业务报文。
SFF1接收到SF1发送的处理后的原始业务报文后，为处理后的原始业务报文封装SRH和IPv6头，得到第三业务报文，并向SFF2发送第三业务报文。
从图5中可以看出，SFF2可以接收到第二业务报文和第三业务报文。
SFF2识别到第二业务包括的随流检测选项中包括复制标记信息，则基于随流检测选项进行随流检测，并向SFF3转发第二业务报文。
SFF2可以向SF2发送第三业务报文中的原始业务报文，在接收到SF2处理后的原始业务报文之后，为处理后的原始业务报文封装IPv6头和SRH头，得到第四业务报文，并向SFF3转发第四业务报文。
SFF3可以接收到第二业务报文和第四业务报文，由于SFF3为尾节点，所以SFF3可以向后续设备(比如CE设备)发送第四业务报文包括的原始业务报文，并丢弃第二业务报文。
可选地，SFF1和SFF3的SID的类型也可以为End.AM类型，在这种情况下，SFF1和SFF2仍然按照上述方法在转发路径上发送第二业务报文，并按照End.AM类型的节点的处理方式，处理第一业务报文。SFF1可以将第一业务报文的目的地址更新为SL＝0的segment，然后将第一业务报文中的随流检测选项删除，并向SF1发送处理后的第一业务报文，SFF1接收到SF1返回的业务报文后，可按照协议规定的方式继续转发该报文。如此，服务节点不会接收到带有随流检测选项的业务报文，不会增加对服务节点的要求。
基于相同的发明构思，本申请实施例还提供了一种报文发送装置，该装置应用于网络设备，如图6所示，该装置包括：
接收模块601，用于接收第一业务报文，第一业务报文包括目的地址、第一随流检测选项、分段路由头SRH和原始业务报文，SRH包括SID列表，SID列表指示转发路径；
发送模块602，用于若目的地址为本地配置的代理SID，则在转发路径上发送第二业务报文，并向服务功能节点发送原始业务报文；
其中，第二业务报文包括第二随流检测选项，第二随流检测选项包括复制标记信息，复制标记信息用于指示第二业务报文为第一业务报文的复制报文。
可选地，该装置还包括：判断模块和复制模块；
判断模块，用于判断第一随流检测选项中是否包括复制标记信息；
发送模块602，还用于若判断模块的判断结果为是，则在转发路径上发送第一业务报文；
复制模块，用于若判断模块的判断结果为否，则复制第一业务报文，并在复制的第一业务报文的随流检测选项中添加复制标记信息，得到第二业务报文。
可选地，该装置还包括：第一丢弃模块；
判断模块，还用于判断目的地址是否为SID列表中最后一个SID；
第一丢弃模块，用于若判断模块的判断结果为是，则丢弃第一业务报文；
发送模块602，用于若判断模块的判断结果为否，则在转发路径上发送第一业务报文。
可选地，该装置还包括：获取模块、第二丢弃模块和复制模块；
获取模块，用于获取网络设备与服务功能节点之间链路的链路状态；
第二丢弃模块，用于若链路状态为不可达，则丢弃第一业务报文；
复制模块，用于若链路状态为可达，则复制第一业务报文，并在复制的第一业务报文的随流检测选项中添加复制标记信息，得到第二业务报文。
可选地，获取模块，具体用于：
从数据平面获取网络设备与服务功能节点之间链路的链路状态；
其中，若服务功能节点故障和/或网络设备与服务功能节点之间链路存在故障，则链路状态为不可达；
若服务功能节点未故障，且网络设备与服务功能节点之间链路未故障，则链路状态为可达。
可选地，第二业务报文的随流检测选项包括保留字段，保留字段承载复制标记信息。
本申请另一实施例还提供了一种网络设备，如图7所示，该网络设备包括：处理器701；收发器704；机器可读存储介质702，机器可读存储介质702存储有能够被处理器701执行的机器可执行指令；机器可执行指令促使处理器701执行以下步骤：
通过收发器704接收第一业务报文，第一业务报文包括目的地址、第一随流检测选项、分段路由头SRH和原始业务报文，SRH包括SID列表，SID列表指示转发路径；
若目的地址为本地配置的代理SID，则通过收发器704在转发路径上发送第二业务报文，并向服务功能节点发送原始业务报文；
其中，第二业务报文包括第二随流检测选项，第二随流检测选项包括复制标记信息，复制标记信息用于指示第二业务报文为第一业务报文的复制报文。
可选地，机器可执行指令还促使处理器701执行以下步骤：
判断第一随流检测选项中是否包括复制标记信息；
若是，则通过收发器704在转发路径上发送第一业务报文；
若否，则复制第一业务报文，并在复制的第一业务报文的随流检测选项中添加复制标记信息，得到第二业务报文。
可选地，机器可执行指令还促使处理器701执行以下步骤：
判断目的地址是否为SID列表中最后一个SID；
若是，则丢弃第一业务报文；
若否，则通过收发器704在转发路径上发送第一业务报文。
可选地，机器可执行指令还促使处理器701执行以下步骤：
获取网络设备与服务功能节点之间链路的链路状态；
若链路状态为不可达，则丢弃第一业务报文；
若链路状态为可达，则复制第一业务报文，并在复制的第一业务报文的随流检测选项中添加复制标记信息，得到第二业务报文。
可选地，机器可执行指令还促使处理器701执行以下步骤：
从数据平面获取网络设备与服务功能节点之间链路的链路状态；
其中，若服务功能节点故障和/或网络设备与服务功能节点之间链路存在故障，则链路状态为不可达；
若服务功能节点未故障，且网络设备与服务功能节点之间链路未故障，则链路状态为可达。
可选地，第二业务报文的随流检测选项包括保留字段，保留字段承载复制标记信息。
如图7所示，网络设备还可以包括通信总线703。处理器701、机器可读存储介质702及收发器704之间通过通信总线703完成相互间的通信，通信总线703可以是外设部件互连标准(Peripheral Component Interconnect，PCI)总线或扩展工业标准结构(Extended Industry Standard Architecture，EISA)总线等。该通信总线703可以分为地址总线、数据总线、控制总线等。
收发器704可以为无线通信模块，收发器704在处理器701的控制下，与其他设备进行数据交互。
机器可读存储介质702可以包括随机存取存储器(Random Access Memory，RAM)，也可以包括非易失性存储器(Non-Volatile Memory，NVM)，例如至少一个磁盘存储器。另外，机器可读存储介质702还可以是至少一个位于远离前述处理器的存储装置。
处理器701可以是通用处理器，包括中央处理器(Central Processing Unit，CPU)、网络处理器(Network Processor，NP)等；还可以是数字信号处理器(Digital Signal Processing，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现场可编程门阵列(Field-Programmable Gate Array，FPGA)或其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。
基于同一种发明构思，根据上述本申请实施例提供的报文发送方法，本申请实施例还提供了一种机器可读存储介质，机器可读存储介质存储有能够被处理器执行的机器可执行指令。处理器被机器可执行指令促使实现上述任一报文发送方法的步骤。
在本申请提供的又一实施例中，还提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述实施例中任一报文发送方法的步骤。
需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
以上所述仅为本申请的较佳实施例，并不用以限制本申请，凡在本申请的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本申请保护的范围之内。

Claims (20)

  1. 一种报文发送方法，其特征在于，所述方法应用于网络设备，所述方法包括：
    接收第一业务报文，所述第一业务报文包括目的地址、第一随流检测选项、分段路由头SRH和原始业务报文，所述SRH包括SID列表，所述SID列表指示转发路径；
    若所述目的地址为本地配置的代理SID，则在所述转发路径上发送第二业务报文，并向服务功能节点发送所述原始业务报文；
    其中，所述第二业务报文包括第二随流检测选项，所述第二随流检测选项包括复制标记信息，所述复制标记信息用于指示所述第二业务报文为所述第一业务报文的复制报文。
  2. 根据权利要求1所述的方法，其特征在于，所述在所述转发路径上发送第二业务报文之前，所述方法还包括：
    判断所述第一随流检测选项中是否包括复制标记信息；
    若是，则在所述转发路径上发送所述第一业务报文；
    若否，则复制所述第一业务报文，并在复制的第一业务报文的随流检测选项中添加所述复制标记信息，得到所述第二业务报文。
  3. 根据权利要求2所述的方法，其特征在于，在所述转发路径上发送所述第一业务报文之前，所述方法还包括：
    判断所述目的地址是否为所述SID列表中最后一个SID；
    若是，则丢弃所述第一业务报文；
    若否，则在所述转发路径上发送所述第一业务报文。
  4. 根据权利要求1或2所述的方法，其特征在于，在所述转发路径上发送第二业务报文之前，所述方法还包括：
    获取所述网络设备与所述服务功能节点之间链路的链路状态；
    若所述链路状态为不可达，则丢弃所述第一业务报文；
    若所述链路状态为可达，则复制所述第一业务报文，并在复制的第一业务报文的随流检测选项中添加所述复制标记信息，得到所述第二业务报文。
  5. 根据权利要求4所述的方法，其特征在于，所述获取所述网络设备与所述服务功能节点之间链路的链路状态，具体包括：
    从数据平面获取所述网络设备与所述服务功能节点之间链路的链路状态；
    其中，若所述服务功能节点故障和/或所述网络设备与所述服务功能节点之间链路存在故障，则所述链路状态为不可达；
    若所述服务功能节点未故障，且所述网络设备与所述服务功能节点之间链路未故障，则所述链路状态为可达。
  6. 根据权利要求1所述的方法，其特征在于，所述第二业务报文的随流检测选项包括保留字段，所述保留字段承载所述复制标记信息。
  7. 一种报文发送装置，其特征在于，所述装置应用于网络设备，所述装置包括：
    接收模块，用于接收第一业务报文，所述第一业务报文包括目的地址、第一随流检测选项、分段路由头SRH和原始业务报文，所述SRH包括SID列表，所述SID列表指示转发路径；
    发送模块，用于若所述目的地址为本地配置的代理SID，则在所述转发路径上发送第二业务报文，并向服务功能节点发送所述原始业务报文；
    其中，所述第二业务报文包括第二随流检测选项，所述第二随流检测选项包括复制标记信息，所述复制标记信息用于指示所述第二业务报文为所述第一业务报文的复制报文。
  8. 根据权利要求7所述的装置，其特征在于，所述装置还包括：判断模块和复制模块；
    所述判断模块，用于判断所述第一随流检测选项中是否包括复制标记信息；
    所述发送模块，具体用于若所述判断模块的判断结果为是，则在所述转发路径上发送所述第一业务报文；
    所述复制模块，用于若所述判断模块的判断结果为否，则复制所述第一业务报文，并在复制的第一业务报文的随流检测选项中添加所述复制标记信息，得到所述第二业务报文。
  9. 根据权利要求8所述的装置，其特征在于，所述装置还包括：第一丢弃模块；
    所述判断模块，还用于判断所述目的地址是否为所述SID列表中最后一个SID；
    所述第一丢弃模块，用于若所述判断模块的判断结果为是，则丢弃所述第一业务报文；
    所述发送模块，具体用于若所述判断模块的判断结果为否，则在所述转发路径上发送所述第一业务报文。
  10. 根据权利要求7或8所述的装置，其特征在于，所述装置还包括：获取模块、第二丢弃模块和复制模块；
    所述获取模块，用于获取所述网络设备与所述服务功能节点之间链路的链路状态；
    所述第二丢弃模块，用于若所述链路状态为不可达，则丢弃所述第一业务报文；
    所述复制模块，用于若所述链路状态为可达，则复制所述第一业务报文，并在复制的第一业务报文的随流检测选项中添加所述复制标记信息，得到所述第二业务报文。
  11. 根据权利要求10所述的装置，其特征在于，所述获取模块，具体用 于：
    从数据平面获取所述网络设备与所述服务功能节点之间链路的链路状态；
    其中，若所述服务功能节点故障和/或所述网络设备与所述服务功能节点之间链路存在故障，则所述链路状态为不可达；
    若所述服务功能节点未故障，且所述网络设备与所述服务功能节点之间链路未故障，则所述链路状态为可达。
  12. 根据权利要求7所述的装置，其特征在于，所述第二业务报文的随流检测选项包括保留字段，所述保留字段承载所述复制标记信息。
  13. 一种网络设备，其特征在于，所述网络设备包括：
    处理器；
    收发器；
    机器可读存储介质，所述机器可读存储介质存储有能够被所述处理器执行的机器可执行指令；所述机器可执行指令促使所述处理器执行以下步骤：
    通过所述收发器接收第一业务报文，所述第一业务报文包括目的地址、第一随流检测选项、分段路由头SRH和原始业务报文，所述SRH包括SID列表，所述SID列表指示转发路径；
    若所述目的地址为本地配置的代理SID，则通过所述收发器在所述转发路径上发送第二业务报文，并向服务功能节点发送所述原始业务报文；
    其中，所述第二业务报文包括第二随流检测选项，所述第二随流检测选项包括复制标记信息，所述复制标记信息用于指示所述第二业务报文为所述第一业务报文的复制报文。
  14. 根据权利要求13所述的网络设备，其特征在于，所述机器可执行指令还促使所述处理器执行以下步骤：
    判断所述第一随流检测选项中是否包括复制标记信息；
    若是，则通过所述收发器在所述转发路径上发送所述第一业务报文；
    若否，则复制所述第一业务报文，并在复制的第一业务报文的随流检测选项中添加所述复制标记信息，得到所述第二业务报文。
  15. 根据权利要求14所述的网络设备，其特征在于，所述机器可执行指令还促使所述处理器执行以下步骤：
    判断所述目的地址是否为所述SID列表中最后一个SID；
    若是，则丢弃所述第一业务报文；
    若否，则通过所述收发器在所述转发路径上发送所述第一业务报文。
  16. 根据权利要求13或14所述的网络设备，其特征在于，所述机器可执行指令还促使所述处理器执行以下步骤：
    获取所述网络设备与所述服务功能节点之间链路的链路状态；
    若所述链路状态为不可达，则丢弃所述第一业务报文；
    若所述链路状态为可达，则复制所述第一业务报文，并在复制的第一业 务报文的随流检测选项中添加所述复制标记信息，得到所述第二业务报文。
  17. 根据权利要求16所述的网络设备，其特征在于，所述机器可执行指令还促使所述处理器执行以下步骤：
    从数据平面获取所述网络设备与所述服务功能节点之间链路的链路状态；
    其中，若所述服务功能节点故障和/或所述网络设备与所述服务功能节点之间链路存在故障，则所述链路状态为不可达；
    若所述服务功能节点未故障，且所述网络设备与所述服务功能节点之间链路未故障，则所述链路状态为可达。
  18. 根据权利要求13所述的网络设备，其特征在于，所述第二业务报文的随流检测选项包括保留字段，所述保留字段承载所述复制标记信息。
  19. 一种机器可读存储介质，其特征在于，存储有机器可执行指令，在被处理器调用和执行时，所述机器可执行指令促使所述处理器：实现权利要求1-6任一所述的方法步骤。
  20. 一种计算机程序产品，其特征在于，所述计算机程序产品促使所述处理器：实现权利要求1-6任一所述的方法步骤。
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